SU1554006A2 - Device for lecture demonstrations - Google Patents

Abstract

The device for lecture demonstrations is related to educational devices in physics and is an improvement of the device according to the author. N 1213498. The purpose of the invention is to increase the consistency, image stability and enhance the demonstration capabilities by providing a demonstration of the piezoelectric effect. The device contains a laser, a screen and two optical elements, one of which is made in the form of a positive lens, and the other in the form of a collecting lens with a translucent coating on the side facing the laser. New in the device is that both lenses are located in the holder mounted on the laser housing, while the collecting lens is rigidly connected to the piezoceramic ring rigidly fixed between the two electrodes located in the holder and connected to the power supply. 1 il.

Description

The invention relates to educational devices in physics.

The purpose of the invention is to increase the consistency, image stability and expand the demonstration capabilities of the device by providing a demonstration of the piezoelectric effect.

The drawing shows the proposed device.

The device comprises a laser 1 and a front mirror of the optical resonator 2. On the laser case 1, a clamp 4 is mounted with a clamping element 3 with two spectrodes 5 connected to a power source and a piezoceramic ring 6 fixed between two electrodes. The collecting lens 7 is rigidly connected to the piezoceramic ring 6, and

The side facing the laser has a translucent coating. In order to increase the aperture of the light cone of the outgoing radiation, a positive lens 8 is mounted in the holder 4. The electrodes 5 are insulated with spacers 9.

The collar C is provided with three 1U clamping elements arranged at an angle of 120 ° to each other, allowing the optical system to be adjusted.

In addition, the device has a screen 11 removed from the laser.

The device works as follows.

Before the start of the demonstration, with the help of three clamping elements 10 located on the holder 4, the optical system is adjusted as follows.

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so that on the screen And there was an interference pattern in the form of rings.

When the power supply is disconnected, the device displays on the screen 11, the appearance of interference: radiation from laser 1 enters the interferometer formed by the front mirror of the optical resonator 2 and a translucent coating applied to the concave Q or the flat side facing the laser 1 which collects concave-convex or flat - a convex lens 7 and adjusted so that the greatest contribution to the interference is made by the rays that have experienced single and double reflections, which, coming out of it and passing through the positive lens 8, increase th aperture of the radiation is displayed on the screen 11 as the interference pattern, showing two kinds of interference phenomena, depending on the design of the collecting lens (concave-convex - appearance of bands of equal inclination, plano-convex - phenomenon strips of equal thickness).

When voltage is applied to the ring electrodes 5, the thickness of the piezoceramic ring 6 and the length of the interferometer formed by the front mirror of the optical resonator 2 and the translucent coating applied on the side facing to

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the laser 1 of the collecting lens 7, as a result of which the radiation that passes through the positive lens 8, increasing its aperture, changes on the screen 11, the corresponding changes in the interference pattern in the form of rings diverging to the periphery, which illustrates the piezoelectric effect. A change in the magnitude of the applied voltage to the ring electrodes 5 permits a quantitative assessment of the deformation of the piezoceramic ring.

Claims (1)

Invention Formula e ni Device for lecture demonstrations by ed. St. f, characterized in that, in order to increase the consistency, image stability and enhance the demonstration capabilities by enabling the demonstration of the piezoelectric effect, it has a holder with two electrodes connected to the power source and a piezoceramic ring fixed on the laser body between the two electrodes, while the collecting lens is rigidly connected to the piezo-ceramic ring, and the positive lens is mounted in the holder. i Editor A.Revin Compiled by M. Konovalenko Tehred M. Khodanich Proofreader L. Bezkid Order 59 Circulation 3 & 7 VNIIPI State Committee for Inventions and Discoveries at the State Committee on Science and Technology of the USSR, Moscow, F-35, Raushsk nab. D. V5 P S s Subscription